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<?php |
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/* |
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* This file is part of the phpflo/phpflo package. |
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* |
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* (c) Henri Bergius <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace PhpFlo\Component; |
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use PhpFlo\Component; |
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/** |
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* Component for creating a simple queue of messages. |
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* |
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* All incomming messages are kept in memory. As soon as the queue reaches the |
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* pre-configured size of 100 messages, the current list of messages is send. |
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* |
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* You can reconfigure the queue size of the component by sending a message to |
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* the `size` input port of this component. If the incomming data is not a |
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* positive integer, an error message will be send to the `err` out port of this |
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* component. |
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* |
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* @author Marijn Huizendveld <[email protected]> |
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*/ |
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class Queue extends Component |
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{ |
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/** |
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* @var integer |
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*/ |
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private $size; |
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/** |
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* @var array<mixed> |
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*/ |
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private $messages; |
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public function __construct() |
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{ |
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$this->size = 100; |
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$this->messages = []; |
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$this->inPorts() |
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->add('in', ['datatype' => 'all']) |
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->add('size', ['datatype' => 'all']); |
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$this->outPorts() |
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->add('error', ['datatype' => 'all']) |
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->add('messages', ['datatype' => 'all']); |
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$this->inPorts()->in->on('data', [$this, 'onAppendQueue']); |
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$this->inPorts()->in->on('detach', [$this, 'onStreamEnded']); |
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$this->inPorts()->size->on('data', [$this, 'onResize']); |
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} |
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/** |
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* @param mixed $data |
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*/ |
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public function onAppendQueue($data) |
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{ |
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$this->messages[] = $data; |
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$this->sendQueue(); |
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} |
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public function onStreamEnded() |
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{ |
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$this->flushQueue(); |
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} |
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/** |
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* @param mixed $data |
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*/ |
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public function onResize($data) |
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{ |
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if (!is_int($data) || 0 > $data) { |
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$dumped = var_dump($data); |
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$this->outPorts()->error->send( |
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"Invalid queue size: '{$dumped}'. Queue resize operation expects a positive integer value." |
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); |
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} |
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$this->size = $data; |
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$this->sendQueue(); |
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} |
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private function sendQueue() |
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{ |
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if ($this->size <= count($this->messages)) { |
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$this->flushQueue(); |
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} |
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} |
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private function flushQueue() |
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{ |
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$this->outPorts() |
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->messages |
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->send($this->messages) |
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->disconnect(); |
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$this->messages = []; |
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} |
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} |
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